/*
 * Copyright (C) 2001-2010 Jacek Sieka, arnetheduck on gmail point com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#if !defined(CONNECTION_MANAGER_H)
#define CONNECTION_MANAGER_H

#include "TimerManager.h"

#include "UserConnection.h"
#include "User.h"
#include "CriticalSection.h"
#include "Singleton.h"
#include "Util.h"

#include "ConnectionManagerListener.h"

namespace dcpp {

class SocketException;

class ConnectionQueueItem {
public:
    typedef ConnectionQueueItem* Ptr;
    typedef vector<Ptr> List;
    typedef List::iterator Iter;

    enum State {
        CONNECTING,                 // Recently sent request to connect
        WAITING,                    // Waiting to send request to connect
        NO_DOWNLOAD_SLOTS,          // Not needed right now
        ACTIVE                      // In one up/downmanager
    };

    ConnectionQueueItem(const UserPtr& aUser, bool aDownload, const string& hubHint_) : token(Util::toString(Util::rand())), hubHint(hubHint_), lastAttempt(0), state(WAITING), download(aDownload), user(aUser) { }

    UserPtr& getUser() { return user; }
    const UserPtr& getUser() const { return user; }

    GETSET(string, token, Token);
    GETSET(string, hubHint, HubHint);
    GETSET(uint64_t, lastAttempt, LastAttempt);
    GETSET(State, state, State);
    GETSET(bool, download, Download);
private:
    ConnectionQueueItem(const ConnectionQueueItem&);
    ConnectionQueueItem& operator=(const ConnectionQueueItem&);

    UserPtr user;
};

class ExpectedMap {
public:
    void add(const string& aNick, const string& aMyNick, const string& aHubUrl) {
        Lock l(cs);
        expectedConnections.insert(make_pair(aNick, make_pair(aMyNick, aHubUrl)));
    }

    StringPair remove(const string& aNick) {
        Lock l(cs);
        ExpectMap::iterator i = expectedConnections.find(aNick);

        if(i == expectedConnections.end())
            return make_pair(Util::emptyString, Util::emptyString);

        StringPair tmp = i->second;
        expectedConnections.erase(i);

        return tmp;
    }

private:
    /** Nick -> myNick, hubUrl for expected NMDC incoming connections */
    typedef map<string, StringPair> ExpectMap;
    ExpectMap expectedConnections;

    CriticalSection cs;
};

// Comparing with a user...
inline bool operator==(ConnectionQueueItem::Ptr ptr, const UserPtr& aUser) { return ptr->getUser() == aUser; }

class ConnectionManager : public Speaker<ConnectionManagerListener>,
    public UserConnectionListener, TimerManagerListener,
    public Singleton<ConnectionManager>
{
public:
    void nmdcExpect(const string& aNick, const string& aMyNick, const string& aHubUrl) {
        expectedConnections.add(aNick, aMyNick, aHubUrl);
    }

    void nmdcConnect(const string& aServer, uint16_t aPort, const string& aMyNick, const string& hubUrl, const string& encoding);
    //void adcConnect(const OnlineUser& aUser, uint16_t aPort, const string& aToken, bool secure);
    void adcConnect(const OnlineUser& aUser, uint16_t aPort, const string& aToken, bool secure);
    void adcConnect(const OnlineUser& aUser, uint16_t aPort, uint16_t localPort, BufferedSocket::NatRoles natRole, const string& aToken, bool secure);

    void getDownloadConnection(const UserPtr& aUser, const string& hubHint);
    void force(const UserPtr& aUser);

    void disconnect(const UserPtr& aUser); // disconnect downloads and uploads
    void disconnect(const UserPtr& aUser, int isDownload);

    void shutdown();

    /** Find a suitable port to listen on, and start doing it */
    void listen() throw(SocketException);
    void disconnect() throw();

    uint16_t getPort() { return server ? static_cast<uint16_t>(server->getPort()) : 0; }
    uint16_t getSecurePort() { return secureServer ? static_cast<uint16_t>(secureServer->getPort()) : 0; }
private:

    class Server : public Thread {
    public:
        Server(bool secure_, uint16_t port, const string& ip = "0.0.0.0");
        uint16_t getPort() { return port; }
        virtual ~Server() { die = true; join(); }
    private:
        virtual int run() throw();

        Socket sock;
        uint16_t port;
        string ip;
        bool secure;
        bool die;
    };

    friend class Server;

    CriticalSection cs;

    /** All ConnectionQueueItems */
    ConnectionQueueItem::List downloads;
    ConnectionQueueItem::List uploads;

    /** All active connections */
    UserConnectionList userConnections;

    StringList features;
    StringList adcFeatures;

    ExpectedMap expectedConnections;

    uint32_t floodCounter;

    Server* server;
    Server* secureServer;

    bool shuttingDown;

    friend class Singleton<ConnectionManager>;
    ConnectionManager();

    virtual ~ConnectionManager() throw() { shutdown(); }

    UserConnection* getConnection(bool aNmdc, bool secure) throw();
    void putConnection(UserConnection* aConn);

    void addUploadConnection(UserConnection* uc);
    void addDownloadConnection(UserConnection* uc);

    ConnectionQueueItem* getCQI(const UserPtr& aUser, bool download, const string& hubHint);
    void putCQI(ConnectionQueueItem* cqi);

    void accept(const Socket& sock, bool secure) throw();

    // UserConnectionListener
    virtual void on(Connected, UserConnection*) throw();
    virtual void on(Failed, UserConnection*, const string&) throw();
    virtual void on(CLock, UserConnection*, const string&, const string&) throw();
    virtual void on(Key, UserConnection*, const string&) throw();
    virtual void on(Direction, UserConnection*, const string&, const string&) throw();
    virtual void on(MyNick, UserConnection*, const string&) throw();
    virtual void on(Supports, UserConnection*, const StringList&) throw();

    virtual void on(AdcCommand::SUP, UserConnection*, const AdcCommand&) throw();
    virtual void on(AdcCommand::INF, UserConnection*, const AdcCommand&) throw();
    virtual void on(AdcCommand::STA, UserConnection*, const AdcCommand&) throw();

    // TimerManagerListener
    virtual void on(TimerManagerListener::Second, uint32_t aTick) throw();
    virtual void on(TimerManagerListener::Minute, uint32_t aTick) throw();

};

} // namespace dcpp

#endif // !defined(CONNECTION_MANAGER_H)
